Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2011-02-15
2011-02-15
Leykin, Rita (Department: 2837)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
C361S025000, C361S026000, C361S103000, C361S124000, C318S471000, C318S472000, C318S473000, C318S434000, C318S432000, C318S445000, C318S700000, C318S822000, C318S364000, C388S903000, C388S909000, C337S298000
Reexamination Certificate
active
07889462
ABSTRACT:
At least one embodiment of the invention relates to a protective circuit for protection of an appliance, in particular of an electric motor, against thermal overloading. In at least one embodiment, the protective circuit includes a first and a second terminal for connecting a temperature detection element; a detection unit for detecting whether a resistance value of the temperature detector element which is connected between the first and the second terminals, is in a first or a second resistance range; a short-circuit detector for identifying whether there is a short circuit between the first and the second terminals; signaling outputs for emitting signal messages to an evaluation unit when the detected resistance value is in the second resistance range and/or when a short circuit has been identified by the short-circuit detector; and a third terminal, which is connected to the second terminal via a predetermined resistance.
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Fritsch Andreas
Koller Josef
Meier Markus
Seitz Johann
Spindler Konrad
Harness & Dickey & Pierce P.L.C.
Leykin Rita
Siemens Aktiengesellschaft
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